CN112355231B - Water glass precoated sand for casting and preparation method thereof - Google Patents
Water glass precoated sand for casting and preparation method thereof Download PDFInfo
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- CN112355231B CN112355231B CN202011251306.6A CN202011251306A CN112355231B CN 112355231 B CN112355231 B CN 112355231B CN 202011251306 A CN202011251306 A CN 202011251306A CN 112355231 B CN112355231 B CN 112355231B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/167—Mixtures of inorganic and organic binding agents
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Abstract
The invention relates to water glass precoated sand for casting, which is formed by coating a layer of organic resin film on the surface of sand grains and then coating a water glass binder on the surface of the organic resin film by using a silane coupling agent. The organic resin film can be decomposed by high-temperature combustion in the casting process of the precoated sand, and the collapsibility of the sodium silicate sand is effectively improved. In a preferable scheme, the water glass coated sand is coated with a hydrophobic fumed silica layer outside a water glass binder film, so that the influence of moisture in the air on the coated sand can be effectively isolated. And because the hydrophobic fumed silica has high fluidity and small size effect, the surface of the sand core can be more compact and finer, and the surface quality of the casting is better. The invention also provides a preparation method of the water glass precoated sand.
Description
Technical Field
The invention relates to the technical field of casting materials, in particular to water glass precoated sand for casting and a preparation method of the precoated sand.
Background
The inorganic binder (such as sodium silicate, commonly known as water glass) is an environment-friendly casting binder, has no smoke and dust in the production process, effectively improves the casting production operation environment and protects the health of workers. However, the inorganic binder needs to be mixed and prepared on site and then used immediately, so that the reconstruction of enterprise equipment is large, and the site management of raw materials occupies more site resources. And the use of the inorganic binder has the problems of great environmental influence, difficult sand mixing quality control, poor collapsibility and the like. Therefore, inorganic binders have not been widely used in foundry production.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The first purpose of the present invention is to provide water glass coated sand for casting.
The second purpose of the invention is to provide a preparation method of the precoated sand.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention relates to water glass precoated sand for casting, which is prepared from the following raw materials in parts by weight: 90.5-98 parts of raw sand, 0.6-1.3 parts of phenolic resin, 0.07-0.1 part of urotropine, 0.2-0.8 part of silane coupling agent and 1.2-2.0 parts of water glass binder.
Preferably, the water glass coated sand further contains 0.08 to 0.11 parts of hydrophobic fumed silica.
Preferably, the urotropine is added in the form of urotropine aqueous solution, and the urotropine aqueous solution contains 0.03-0.08 part of water and 0.07-0.1 part of urotropine.
Preferably, the silane coupling agent is added in the form of an aqueous solution of the silane coupling agent, and the solution of the silane coupling agent contains 0.4 to 1.0 part of water and 0.2 to 0.8 part of KH550 type silane coupling agent.
The invention also relates to a preparation method of the water glass precoated sand, which comprises the steps of heating the raw sand, uniformly mixing the heated raw sand with the phenolic resin, then sequentially adding the urotropine aqueous solution, the silane coupling agent aqueous solution, the water glass binder and the hydrophobic fumed silica, and uniformly stirring to obtain the water glass precoated sand.
Preferably, the preparation method of the water glass coated sand comprises the following steps:
1) heating raw sand, adding the heated raw sand and phenolic resin into a sand mixing barrel, and uniformly stirring;
2) adding the urotropine solution into a sand mixing barrel, and uniformly stirring;
3) adding the silane coupling agent solution into a sand mixing barrel, and uniformly stirring;
4) adding the water glass binder into a sand mixing barrel, introducing hot air and uniformly stirring;
5) and adding the hydrophobic fumed silica into a sand mixing barrel, uniformly stirring and sieving to obtain the water glass coated sand.
Preferably, in the step 1), the heating temperature of the raw sand is 120-170 ℃.
Preferably, in the step 1), the stirring time after adding the phenolic resin is 10-20 s.
Preferably, in the step 2), the stirring time after the urotropine aqueous solution is added is 30-50 s.
Preferably, in the step 3), the stirring time after the silane coupling agent aqueous solution is added is 20 to 45 s.
Preferably, in the step 4), the stirring time after the water glass binder is added is 40-60s, the hot air temperature is 50-80 ℃, and the air speed is 8-15 m/s.
Preferably, in step 5), the stirring time after the hydrophobic fumed silica is added is 20 to 45 s.
The invention has the beneficial effects that:
the invention provides water glass precoated sand for casting, which is formed by coating a layer of organic resin film on the surface of sand grains and then coating a water glass binder on the surface of the organic resin film by using a silane coupling agent. The organic resin film can be decomposed by high-temperature combustion in the casting process of the precoated sand, and the collapsibility of the sodium silicate sand is effectively improved.
In a preferable scheme, the water glass coated sand is coated with a hydrophobic fumed silica layer outside a water glass film, so that the influence of moisture in the air on the coated sand can be effectively isolated. The hydrophobic fumed silica has high fluidity and small size effect, so that the surface of the sand core is more compact and finer, and the surface quality of the casting is better.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The embodiment of the invention relates to water glass precoated sand for casting, which is prepared from the following raw materials in parts by weight: 90.5-98 parts of raw sand, 0.6-1.3 parts of phenolic resin, 0.07-0.1 part of urotropine, 0.2-0.8 part of silane coupling agent and 1.2-2.0 parts of water glass binder.
In one embodiment of the invention, the water glass coated sand further contains 0.08-0.11 parts of hydrophobic fumed silica.
In one embodiment of the present invention, urotropin is added in the form of an aqueous urotropin solution comprising water 0.03-0.08 parts and urotropin 0.07-0.1 parts.
In one embodiment of the present invention, the silane coupling agent is added in the form of an aqueous solution of the silane coupling agent, which contains 0.4 to 1.0 part of water and 0.2 to 0.8 part of the silane coupling agent.
The embodiment of the invention also relates to a preparation method of the water glass precoated sand, which comprises the steps of heating the raw sand, uniformly mixing the heated raw sand with the phenolic resin, then sequentially adding the urotropine aqueous solution, the silane coupling agent aqueous solution and the water glass binder, finally selectively adding the hydrophobic fumed silica, and uniformly stirring to obtain the water glass precoated sand.
Further, the preparation method of the water glass coated sand comprises the following steps:
1) heating raw sand, adding the heated raw sand and phenolic resin into a sand mixing barrel, and uniformly stirring;
2) adding the urotropine solution into a sand mixing barrel, and uniformly stirring;
3) adding the silane coupling agent solution into a sand mixing barrel, and uniformly stirring;
4) adding the water glass binder into a sand mixing barrel, introducing hot air and uniformly stirring;
5) and adding the hydrophobic fumed silica into a sand mixing barrel, uniformly stirring and sieving to obtain the water glass coated sand.
In one embodiment of the invention, in the step 1), the raw sand is inner covering roasting sand with the particle size of 50-100 meshes, and the heating temperature of the raw sand is 120-170 ℃. The heating is used for mixing the phenolic resin with the heated raw sand, and the temperature of the heated raw sand melts the phenolic resin so that the phenolic resin is uniformly coated on the surface of the sand grains.
In one embodiment of the invention, in step 1), the stirring time after adding the phenolic resin is 10 to 20 s. The phenol resin is mainly used as a binder, and a modified phenol resin may be used.
In one embodiment of the invention, the stirring time after adding the aqueous solution of urotropine in step 2) is 30-50 s. Urotropin, chemically known as hexamethylenetetramine, is used as a curing agent for resins and plastics. When the precoated sand is heated, the resin coated on the surface of the sand grains is melted, and the melted resin is quickly changed from a linear structure to a non-melted body structure under the action of methylene decomposed from urotropine, so that the precoated sand is solidified and molded.
In one embodiment of the present invention, the stirring time after the addition of the aqueous silane coupling agent solution in step 3) is 20 to 45 seconds. The silane coupling agent generally has a molecular formula of Y-R-Si (OR)3Wherein Y is an organofunctional group and SiOR is a siloxy group. The siloxy group is reactive with inorganic species and the organofunctional group is reactive or compatible with organic species. Thus, when a silane coupling agent is interposed between the inorganic and organic interfaces, a bonding layer of organic matrix-silane coupling agent-inorganic matrix may be formed. The addition of the silane coupling agent can improve the film coating effect of the organic resin so as to increase the mechanical strength of the film coated sand. The silane coupling agent in the present invention may be selected from at least one of KH550, KH560 and KH570, and KH550 is preferable.
In one embodiment of the invention, in the step 4), the stirring time after the water glass binder is added is 40-60s, the hot air temperature is 50-80 ℃, and the air speed is 8-15 m/s. The sodium silicate is used as the main component of the water glass binder, and the fluidity and hardening speed of the raw sand can be improved after a coating film is formed on the surface of the raw sand, so that the quality of castings is improved. However, sodium silicate has the characteristic of easy moisture absorption, so the water glass sand always has the storage problem in the environment with higher humidity, and the organization structure of the water glass is vitrified in a high-temperature state after casting, so the residual strength is high, and the collapsibility is poor.
In order to solve the problems, the invention adds the phenolic resin and the heated raw sand into a sand mixing barrel, and melts the phenolic resin by utilizing the temperature of the heated raw sand so as to uniformly coat the phenolic resin on the surface of the sand grains to form a layer of organic resin film. Then adding a silane coupling agent aqueous solution and a water glass binder, and quickly evaporating the water in the water glass binder under the action of introduced hot air to form a layer of water glass binder film. Under the action of silane coupling agent, a bonding layer of organic matrix-silane coupling agent-inorganic matrix can be formed between the phenolic resin and the interface of the water glass adhesive, so that the surface of the phenolic resin film can be well coated by the water glass adhesive film.
In the casting process of the precoated sand, firstly, the phenolic resin film tightly attached to the surface of sand particles is heated and decomposed from 600 ℃, and the generated gas can form a plurality of holes on the water glass adhesive film, so that the structure of the water glass adhesive film is damaged, the residual strength of the water glass adhesive film is greatly reduced, and the collapsibility problem of the inorganic precoated sand is finally improved.
In one embodiment of the invention, after the water glass binder film is formed on the surface of sand grains, a layer of hydrophobic fumed silica is coated on the surface of the sand grains, so that a hydrophobic layer is formed on the surface of the coated sand, and the effect of isolating moisture in air is achieved. And the hydrophobic fumed silica has high fluidity and small size effect, so that the surface of the sand core is more compact and finer, and the surface quality of the casting is better. The stirring time after addition of the hydrophobic fumed silica is preferably from 20 to 45 s.
Example 1
The water glass precoated sand for casting is prepared from the following raw materials in parts by weight: 96 parts of crude sand, 1 part of phenolic resin, a urotropine solution (containing 0.05 part of water and 0.09 part of urotropine), a silane coupling agent solution (containing 1.1 part of water and 0.12 part of KH550 type silane coupling agent), 1.5 parts of water glass binder and 0.1 part of hydrophobic fumed silica.
Wherein the raw sand is inner covering roasting sand with the grain diameter of 50-100 meshes.
The preparation method of the water glass precoated sand comprises the following steps:
1) heating the raw sand to 150 ℃, adding the raw sand and phenolic resin into a sand mixing barrel, and stirring for 15s until the raw sand and the phenolic resin are uniformly mixed;
2) adding the urotropine solution into a sand mixing barrel, and stirring for 40s until the urotropine solution is uniformly mixed;
3) adding the silane coupling agent solution into a sand mixing barrel, and stirring for 35s until the silane coupling agent solution is uniformly mixed;
4) adding the water glass binder into a sand mixing barrel, introducing hot air with the temperature of 50-80 ℃ and the air speed of 8-15m/s, and stirring for 50s until the mixture is uniformly mixed;
5) and adding the hydrophobic fumed silica into a sand mixing barrel, stirring for 30s until the hydrophobic fumed silica is uniformly mixed, and then sieving by using a 120-mesh sieve to obtain the water glass coated sand.
Comparative example 1
The raw materials and the parts by weight of the water glass precoated sand are the same as those of the example 1, and the preparation method comprises the following steps:
1) heating the raw sand to 150 ℃, adding the raw sand and phenolic resin into a sand mixing barrel, and stirring for 15s until the raw sand and the phenolic resin are uniformly mixed;
2) adding the urotropine solution into a sand mixing barrel, and stirring for 40s until the urotropine solution is uniformly mixed;
3) adding the water glass binder into a sand mixing barrel, introducing hot air with the temperature of 50-80 ℃ and the air speed of 8-15m/s, and stirring for 50s until the mixture is uniformly mixed;
4) adding the silane coupling agent solution into a sand mixing barrel, and stirring for 35s until the silane coupling agent solution is uniformly mixed;
5) and adding the hydrophobic fumed silica into a sand mixing barrel, stirring for 40s until the hydrophobic fumed silica is uniformly mixed, and sieving to obtain the water glass coated sand.
Comparative example 2
The raw materials and the parts by weight of the water glass precoated sand are the same as those of the example 1, and the preparation method comprises the following steps:
1) heating the raw sand to 150 ℃, adding the raw sand and phenolic resin into a sand mixing barrel, and stirring for 15s until the raw sand and the phenolic resin are uniformly mixed;
2) adding the urotropine solution into a sand mixing barrel, and stirring for 40s until the urotropine solution is uniformly mixed;
3) adding hydrophobic fumed silica into a sand mixing barrel, and stirring for 40s until the hydrophobic fumed silica is uniformly mixed;
4) adding the silane coupling agent solution into a sand mixing barrel, and stirring for 35s until the silane coupling agent solution is uniformly mixed;
5) adding the water glass binder into a sand mixing barrel, introducing hot air with the temperature of 50-80 ℃ and the air speed of 8-15m/s, stirring for 50s, uniformly mixing, and sieving to obtain the water glass coated sand.
The water glass precoated sand obtained in the above examples and comparative examples was subjected to tensile strength, crushing compressive strength and moisture absorption resistance tests. The tensile strength is tested by adopting a standard 8-shaped sample, and the collapsibility compressive strength is tested by adopting a standard cylindrical sample; the moisture absorption resistance is expressed by the percentage reduction of tensile strength measured after the precoated sand is made into a sand core and stored in a workshop with the humidity of 65% +/-5 and the temperature of 25 +/-5 ℃ for 24 hours. The test results are shown in Table 1.
TABLE 1
Wherein, the tensile strength reflects the strength of the sand core after the precoated sand is formed. Comparing the data of the example 1 and the comparative example, it can be seen that, in the preparation process of the precoated sand, urotropine is firstly added to cure the phenolic resin, then the silane coupling agent and the water glass binder are sequentially added, the formed organic resin film is tightly combined with the water glass binder film, the interlayer bonding force is improved, and the tensile strength of the precoated sand is improved.
The collapse compressive strength reflects the residual strength of the sand core after casting. Comparing the data of the example 1 and the comparative example, it can be seen that the organic resin is formed on the surface of the sand grains before the water glass adhesive film in the preparation process of the precoated sand, the organic resin film adhered to the sand grains is heated and decomposed from 600 ℃ in the casting process, and the generated gas can form a plurality of holes on the water glass adhesive film, so that the structure of the water glass adhesive film is damaged, and the collapsibility of the precoated sand is improved.
Compared with example 1, comparative example 1 replaces steps 3) and 4), i.e., after adding the urotropine solution, the water glass binder is added first, and then the silane coupling agent solution is added. Comparative example 2) before step 5) was shifted to step 3), i.e., after the urotropine solution was added, the hydrophobic fumed silica was added first, and then the silane coupling agent solution and the water glass binder were added in sequence. It is known that, by changing the order of addition of the water glass binder and the silane coupling agent, the organic resin film cannot be bonded to the water glass binder film by the silane coupling agent, and the improvement of the tensile strength and the crushing compressive strength is limited.
The moisture absorption resistance reflects the percentage of the decrease in tensile strength after 24 hours of storage after the precoated sand is made into a sand core. Comparing the data of example 1 with the data of the comparative example, it can be seen that, in the preparation process of the precoated sand, after the hydrophobic fumed silica is added on the outer sides of the organic resin film and the water glass binder film, a hydrophobic layer can be formed on the surface of the precoated sand, and the problems of moisture absorption and agglomeration of the precoated sand or moisture absorption and deformation of a sand core and the like caused by the fact that the water glass binder film absorbs moisture in the atmosphere can be effectively reduced. If the hydrophobic layer is added between the organic resin film and the water glass adhesive film, or is added inside the organic resin film, the hydrophobic effect cannot be achieved.
The results of searching for the influence of changing the amount of the added phenolic resin on the crushing compressive strength of the water glass-coated sand in example 1 are shown in table 2. The higher the organic resin addition, the lower the collapse compressive strength, and the better the collapse performance of the precoated sand. When the addition of the organic resin reaches 1.0%, the collapsibility compressive strength of the precoated sand reaches the minimum value, and the cast sand core is broken by touch, so that the sand core has an excellent collapsibility effect. However, the addition amount of the organic resin cannot be more than 1.0 percent, otherwise, gas smoke is generated in the core making and casting processes, and the workshop environment is influenced.
TABLE 2
| Phenolic resin addition | Crush compression strength (MPa) |
| 0 | 1.97 |
| 0.6 part | 0.85 |
| 0.8 portion of | 0.32 |
| 1.0 part | ＜0.1 |
| 1.3 parts of | ＜0.1 |
The results of searching for the effect of varying the amount of the silane coupling agent added on the tensile strength of the water glass-coated sand in addition to example 1 are shown in table 3. It is shown that the higher the silane coupling agent addition amount is, the higher the tensile strength is, and the better the sand core strength after the precoated sand molding is. The tensile strength of the precoated sand is derived from the structural strength of a binder film on the surface of sand grains, and the silane coupling agent is added to mainly promote the organic resin film and the water glass binder film to form a binder film with better integrity, so that the tensile strength of the precoated sand reaches the maximum value after the addition of the silane coupling agent reaches the ideal state of promoting the formation of the binder film with better integrity. If the addition amount is increased, the adhesive film is unstable in overall structure due to the presence of a large amount of the silane coupling agent in a free state between the organic resin film and the water glass adhesive film, and the tensile strength is reduced.
TABLE 3
| Silane coupling agent addition | Tensile strength (MPa) |
| 0 | 1.76 |
| 0.2 part | 1.95 |
| 0.4 portion of | 2.21 |
| 0.6 part | 2.59 |
| 0.8 portion of | 2.47 |
| 1 part of | 2.15 |
The results of searching for the influence of varying the amount of hydrophobic fumed silica added on the moisture absorption performance of the water glass-coated sand in addition to example 1 are shown in table 4. The strength of the sand core after being placed is reduced due to the fact that the sand core absorbs moisture in air and becomes soft, and the moisture absorption resistance performance data show the reduction range of the strength of the sand core after being placed for 24 hours. The higher the amount of hydrophobic fumed silica added, the smaller the value, indicating that the smaller the strength drop, the less the sand core absorbs water and the better the moisture absorption resistance of the precoated sand. However, the hydrophobic fumed silica has good thermal resistance, so the addition amount of the hydrophobic fumed silica cannot be too high so as not to influence the curing temperature and time of the precoated sand.
TABLE 4
| Hydrophobic fumed silica addition | Moisture absorption resistance (%) |
| 0 | 76.7 |
| 0.06 part | 60.9 |
| 0.08 portion of | 30.2 |
| 0.1 part | 11.7 |
| 0.12 portion | 11.1 |
From the above-described test results of examples and comparative examples, the present invention has the following advantages:
1. according to the invention, by adding a layer of organic resin film between the inorganic binder film and the sand grains and utilizing the principle that the organic resin can be decomposed by heating at a high temperature to generate gas, the residual strength of the water glass binder in the casting process can be effectively reduced, the collapsibility of the water glass coated sand is greatly improved, and the popularization and application of the inorganic binder in the casting industry are promoted.
2. The invention utilizes the binding capacity of the silane coupling agent between organic and inorganic interfaces to firmly bond the organic resin film and the inorganic adhesive film together, and simultaneously can greatly improve the strength of the composite material, reduce the addition of the adhesive and reduce the production cost.
3. According to the invention, the hydrophobic gas-phase silica forms a hydrophobic layer on the surface of the precoated sand, so that the problem of insufficient storage stability of the precoated sand caused by the influence of atmospheric environment is avoided, the compactness of the sand core can be improved, and the surface quality of a produced casting is better.
4. The invention has simple integral process, lower cost and convenient process control, and can prepare the sodium silicate coated sand meeting the requirement of casting production.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. The water glass precoated sand for casting is characterized by being prepared from the following raw materials in parts by weight: 90.5-98 parts of raw sand, 0.6-1.3 parts of phenolic resin, 0.07-0.1 part of urotropine, 0.2-0.8 part of silane coupling agent, 1.2-2.0 parts of water glass binder and 0.08-0.11 part of hydrophobic fumed silica;
the preparation method of the water glass precoated sand for casting comprises the following steps:
1) heating raw sand, adding the heated raw sand and phenolic resin into a sand mixing barrel, and uniformly stirring;
2) adding the urotropine solution into a sand mixing barrel, and uniformly stirring;
3) adding the silane coupling agent solution into a sand mixing barrel, and uniformly stirring;
4) adding the water glass binder into a sand mixing barrel, introducing hot air and uniformly stirring;
5) and adding the hydrophobic fumed silica into a sand mixing barrel, uniformly stirring and sieving to obtain the water glass coated sand.
2. The water glass-coated foundry sand according to claim 1, wherein urotropin is added in the form of a urotropin aqueous solution, and the urotropin aqueous solution contains 0.03 to 0.08 part of water and 0.07 to 0.1 part of urotropin.
3. The water glass coated sand for casting according to claim 1, wherein the silane coupling agent is added in the form of an aqueous solution of silane coupling agent, and the aqueous solution of silane coupling agent contains 0.4 to 1.0 part of water and 0.2 to 0.8 part of KH550 type silane coupling agent.
4. The water glass coated sand for casting according to claim 1, wherein the heating temperature of the raw sand in step 1) is 120 ℃ to 170 ℃.
5. The water glass precoated sand for casting according to claim 1, wherein in step 1), the stirring time after adding the phenolic resin is 10-20 s;
and/or, in the step 2), the stirring time after the urotropine aqueous solution is added is 30-50 s;
and/or, in the step 3), the stirring time after the silane coupling agent aqueous solution is added is 20-45 s.
6. The water glass precoated sand for casting according to claim 1, wherein in the step 4), the stirring time after the water glass binder is added is 40-60s, the hot air temperature is 50-80 ℃, and the air speed is 8-15 m/s;
and/or in the step 5), the stirring time after the hydrophobic fumed silica is added is 20-45 s.
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| CN113263134B (en) * | 2021-05-12 | 2022-12-06 | 沈阳工业大学 | Additive for core making of composite hardened sodium silicate sand and application thereof |
| CN114367628B (en) * | 2021-12-29 | 2023-08-29 | 天阳新材料科技有限公司 | Vein-resistant precoated sand for turbine shell and preparation method thereof |
| CN114535500B (en) * | 2021-12-31 | 2023-11-14 | 北京航空航天大学宁波创新研究院 | Modified silica fume suspension for casting, modified water glass and use method |
| CN117487105B (en) * | 2024-01-02 | 2024-03-26 | 山东宇世巨化工有限公司 | Preparation method of phenolic resin for precoated sand |
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| CN103586401A (en) * | 2013-11-27 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Precoated sand |
| CN105537503A (en) * | 2016-02-29 | 2016-05-04 | 无锡烨隆精密机械有限公司 | Sand burning preventive precoated sand for casting of turbine casing |
| JP2017225977A (en) * | 2016-06-20 | 2017-12-28 | 旭有機材株式会社 | Mould manufacturing method |
| CN106077425A (en) * | 2016-07-29 | 2016-11-09 | 无锡市三峰仪器设备有限公司 | The most defeated and dispersed a kind of instrument Foundry Coated Sand |
| CN107096871A (en) * | 2017-07-03 | 2017-08-29 | 李吕军 | Accelerate precoated sand of cast member shaping speed and preparation method thereof |
| CN107336146A (en) * | 2017-09-03 | 2017-11-10 | 东莞市金利威磨料磨具有限公司 | A kind of formula and processing method of antidamping resin thin slice grinding wheel |
| CN109909444A (en) * | 2019-03-20 | 2019-06-21 | 广西兰科资源再生利用有限公司 | A kind of high strength casting environmentally friendly precoated sand and preparation method thereof |
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